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Scientific American, Vol. 26, No. 17 (1872) (1872)
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d sidewalk, even with or limb, or loss of time to others who } 4 | \I MTT Ny ee M || the second story, is reached from the are already traveling on it. \, | | | 4 | ; i \ | PW Bd a, ith aha ty Hh | ground by stairways from: every cor. Fig. 1 isa perspective view of the \ | Vytt AN | | ; \ || I ner… … SPEER’S ENDLESS TRAVELING OR RAILWAY SIDEWALK, © 1872 SCIENTIFIC AMERICAN, INCInternet Archive · Public domain (published before 1931). Free to use for anything.
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